Sofa



FIG. 1 is a front perspective view of a sofa, showing my new design, and including a pillow thereon shown herein and throughout in broken lines by way of example only and forming no part of the claimed design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is another rear perspective view thereof;

FIG. 4 is a side view thereof taken from the left of FIG. 1;

FIG. 5 is a side view thereof taken from the right of FIG. 1;

FIG. 6 is a top plan view thereof;

FIG. 7 is a front view thereof;

FIG. 8 is a rear view thereof; and,

FIG. 9 is a front view thereof with a portion in an articulated position. 

I claim, the ornamental design for a sofa, as shown and described. 